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    <title>Document</title>
    <style>
        table, td {
            border: 1px solid pink;
            /* 合并相邻表格的边框 */
            border-collapse: collapse;
        }
        table {
            width: 500px;
            height: 240px;
        }
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<body>
    <table align="center" border="1" cellpadding="0" cellspacing="0" width="500" height="249">
        <tr><th>姓名</th><th>性别</th><th>年龄</th></tr>
        <tr><td>刘德华</td><td>男</td><td>56</td></tr>
        <tr><td>张学友</td><td>男</td><td>58</td></tr>
        <tr><td>郭富城</td><td>男</td><td>51</td></tr>
        <tr><td>黎明</td><td>男</td><td>27</td></tr>
    </table>
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<!DOCTYPE html>
<html lang="en">
    <head>
<link rel="stylesheet" href="15.css">
        <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    </head> 
    <body>
        <h1>CSS盒子模型</h1>
        <div class="box">标准盒子模型</div>
        <div class="box alternate">替代盒子模型，又称怪异盒子模型</div>
        <input type="text" name="" id="" placeholder="盒子边框" class="input_text">
        <br>
        <div class="box2">内边距</div>
        <ul class="menu">
            <li>菜单项1</li>
            <li>菜单项2</li>
            <li>菜单项3</li>
            <li>菜单项4</li>
            <li>菜单项456789012345</li>   
        </ul>
    </body>
</html>